Locking pin



Aug. 27, 1968 J, F. BENNETT LOCKING PIN Filed Dec. 27, 1965 United States Patent 3,398,800 LOCKING PIN James F. Bennett, Stockton, Calif., assignor to International Harvester Company, Chicago, 111., a corporation of Delaware Filed Dec. 27, 1965, Ser. No. 516,255 2 Claims. (Cl. 172-753) ABSTRACT OF THE DISCLOSURE A removable locking pin for securing the socketed foot piece of a subsoiler or the like in telescoping relation on its supporting shank, wherein a cylindrical open ing in the shank registers with beveled openings in opposite walls of the foot piece. The pin is formed of two semicylindrical segments one of which is made of hard steel the ends of which are beveled to seat in the beveled openings in the foot piece and having its fiat diametral face flared at one end. The other pin segment is of relatively soft steel one end of which, when inserted in the said openings engages the flared end of the first segment and is bent to conform to the bevel of the adjacent foot piece opening.

This invention relates to fastening devices and particularly to means for securing an earth working tool to a support.

An object of the invention is the provision of an improved removable locking pin for holding two elements together.

Another object of the invention is the provision of improved locking pin means for holding the earth working tool or foot piece of a suboiler or the like to its supporting shank.

Another object of the invention is the provision of a split key locking pin assembly for holding an earth working tool to its support, wherein said assembly comprises a pair of pin segments, one of which is made of hard metal and the other of soft metal deformable to provide a positive lock for holding the tool on its support but easily removable to permit replacement of the tool.

Other objects and advantages of the invention will be come clear from the following detailed description when read in conjunction with the accompanying drawings, wherein:

FIGURE 1 is a view in side elevation of the lower end of a subsoiler shank having a replaceable earth working point or foot mounted thereon;

FIGURE 2 is an enlarged section on the line 2-2 of FIGURE 1;

FIGURE 3 is a detail viewed from one side of the structure shown in FIGURE 2;

FIGURE 4 is a perspective view of the split key locking pin means of this invention, and

FIGURE 5 is a sectional view on a small scale similar to FIGURE 2 showing the manner in which the locking pin means is assembled in its operating position.

The numeral designates a tool-carrying standard or shank having a forwardly projecting end portion 11 slidably receivable in a socket 12 formed in a subsoiler foot in the form of an earth working tool 13 having an earth penetrating end 14 and laterally spaced rearwardly projecting lapping parts in the form of ears 15.

Under adverse soil conditions the earth working tool or subsoiler point 13 wears rapidly and must be replaced relatively frequently. For releasably holding the tool to the supporting shank, a transverse opening 16 is formed in the shank, and outwardly beveled registering openings 17 are formed in the ears 15 of the subsoiler point. To facilitate replacement of the earth working tool, it has been customary to insert a pin through the registering openings 16 and 17 and to lock the pin in place with cotters. However, cotters are difiiculty removable, and removal of the tool and replacement are facilitated by the novel locking pin means 18 of this invention. Pin means 18 is of the split-key type and includes a longitudinal segment 19 of relatively hard metal such as steel and a mating segment 20 of relatively soft metal.

In assembling the pin means 18 in the registering openings 16 and 17, the semicylindrical segment 19 is first inserted in the openings and the central portion 21 thereof is received in the cylindrical bore 16 in shank 10 and one end is beveled as at 22 to mate with a portion of the beveled opening 17 in one of the ears 15. The other end of segment 19 is beveled as at 23 to substantially mate with a portion of the beveled opening 17 in the other ear 15. The flat diametral face 24 of segment 19 is fiared at 25 radially opposite the bevel 23 for a purpose which will hereinafter become clear.

The other segment 20 of pin 18 is provided with a semicylindrical portion 26 and a beveled end 27 complementing the beveled end 22 of segment 19 and is inserted in the reigstering openings 16 and 17 in the direction indicated in FIGURE 5. Insertion of the locking segment 20 is made manually until the advancing end thereof engages the bevel 25 of the hard steel segment 19, whereupon it is driven in with a hammer or the like, until the end of the segment is bent into the deformed shape shown in FIGURE 2, the fiat diametral face 28 thereof being contiguous with the fiat face 24 of segment 19 and wedging the latter tightly in its portion of the opening. The fiat face 28 of segment 20 is preferably chamfered as at 29 for engagement with the flared end 25 of segment 19 to facilitate insertion of segment 20 in its portion of the registering openings.

Segment 20 is easily removed by striking the end 30 thereof and driving it out of the opening, the deformity being removed in the process so that the locking pin assembly can be reused as many times as the earth penetrating tool 13 is replaced.

It is believed that the construction and operation of the novel locking pin means of this invention will be clearly understood from the foregoing description. It should likewise be understood that the invention has been described in its preferred embodiment and that modifications may be made therein without departing from the spirit of the invention or' the scope of the appended claims.

What is claimed is:

1. In an implement including an earth working tool and a supporting shank having overlapping parts and having cylindrical registering openings therethrough, the openings in the outer of said parts being outwardly tbevele'tl, longitudinally divided cylindrical pin means receivable in said openings comprising a first semicylindrical segment of hard steel adapted to mate with a portion of said openings and beveled at each end to mate with a portion of the beveled openings in said outer of said parts, said first segment having an opposed fiat diametral face flared at one end, and a second semicylindrical segment formed of relatively soft steel having a flat diametral face contiguous with the diametral face of said first segment, said second segment being beveled at one end to mate with the remaining beveled portion of the opening in one of said outer parts, the other end of said second segment being deformable, upon forceable 3 4' insertion of said second segment in said registering operr- References Cited ings, by engagement with said flared end of said first UNITED STATES PATENTS segment to fill theassociated beveled opening and lock said pin means against axial displacement. 2,238,463 4/1941 Dubher 85 8'1 2. The invention set forth in claim 1, wherein said 5 24O9180 10/1946 n ct 85 79 3,175,314 3/1965 W1ll1amson 37142 implement is a subsoiler and said earth working tool is a subsoiler foot having a forward earth penetrating point and a rearwardly opening socket to slidably re- ABRAHAM STONE Pummy Exammer' ceive the lower end of said supporting shank. S. C. PELLEGRINO, Assistant Examiner. 

